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      <a href="../../index.html">all files</a> / <a href="index.html">components/transitions/</a> collapse-transition.js
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { addClass, removeClass } from '@/utils/utils.js'
// 目前需要添加一个dx-collapse-transitionclass动画
const Transition = {
&nbsp;
  beforeEnter(el) {
<span class="cstat-no" title="statement not covered" >    addClass(el, 'dx-collapse-transition')</span>
<span class="cstat-no" title="statement not covered" >    if (!el.dataset) <span class="cstat-no" title="statement not covered" >el.dataset = {}</span></span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    el.dataset.oldPaddingTop = el.style.paddingTop</span>
<span class="cstat-no" title="statement not covered" >    el.dataset.oldPaddingBottom = el.style.paddingBottom</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    el.style.height = '0'</span>
<span class="cstat-no" title="statement not covered" >    el.style.paddingTop = 0</span>
<span class="cstat-no" title="statement not covered" >    el.style.paddingBottom = 0</span>
  },
&nbsp;
  enter(el) {
<span class="cstat-no" title="statement not covered" >    el.dataset.oldOverflow = el.style.overflow</span>
    /* DOM元素操作并不会立即触发元素重绘和重排，
    * 这里读取一次scrollHeight会造成DOM重绘重排，触发动画
    * 否则动画不会启动，会瞬间到达
    */
    // scrollHeight 包括元素的padding，但不包括元素的border和margin
    // 这里 offetHeight = clientHeight = 0
<span class="cstat-no" title="statement not covered" >    if (el.scrollHeight !== 0) {</span>
<span class="cstat-no" title="statement not covered" >      el.style.height = el.scrollHeight + 'px'</span>
<span class="cstat-no" title="statement not covered" >      el.style.paddingTop = el.dataset.oldPaddingTop</span>
<span class="cstat-no" title="statement not covered" >      el.style.paddingBottom = el.dataset.oldPaddingBottom</span>
    } else {
<span class="cstat-no" title="statement not covered" >      el.style.height = ''</span>
<span class="cstat-no" title="statement not covered" >      el.style.paddingTop = el.dataset.oldPaddingTop</span>
<span class="cstat-no" title="statement not covered" >      el.style.paddingBottom = el.dataset.oldPaddingBottom</span>
    }
&nbsp;
<span class="cstat-no" title="statement not covered" >    el.style.overflow = 'hidden'</span>
  },
&nbsp;
  afterEnter(el) {
    // for safari: remove class then reset height is necessary
<span class="cstat-no" title="statement not covered" >    removeClass(el, 'dx-collapse-transition')</span>
<span class="cstat-no" title="statement not covered" >    el.style.height = ''</span>
<span class="cstat-no" title="statement not covered" >    el.style.overflow = el.dataset.oldOverflow</span>
  },
&nbsp;
  beforeLeave(el) {
<span class="cstat-no" title="statement not covered" >    if (!el.dataset) <span class="cstat-no" title="statement not covered" >el.dataset = {}</span></span>
<span class="cstat-no" title="statement not covered" >    el.dataset.oldPaddingTop = el.style.paddingTop</span>
<span class="cstat-no" title="statement not covered" >    el.dataset.oldPaddingBottom = el.style.paddingBottom</span>
<span class="cstat-no" title="statement not covered" >    el.dataset.oldOverflow = el.style.overflow</span>
&nbsp;
<span class="cstat-no" title="statement not covered" >    el.style.height = el.scrollHeight + 'px'</span>
<span class="cstat-no" title="statement not covered" >    el.style.overflow = 'hidden'</span>
  },
&nbsp;
  leave(el) {
<span class="cstat-no" title="statement not covered" >    if (el.scrollHeight !== 0) {</span>
      // for safari: add class after set height, or it will jump to zero height suddenly, weired
<span class="cstat-no" title="statement not covered" >      addClass(el, 'dx-collapse-transition')</span>
<span class="cstat-no" title="statement not covered" >      el.style.height = 0</span>
<span class="cstat-no" title="statement not covered" >      el.style.paddingTop = 0</span>
<span class="cstat-no" title="statement not covered" >      el.style.paddingBottom = 0</span>
    }
  },
&nbsp;
  afterLeave(el) {
<span class="cstat-no" title="statement not covered" >    removeClass(el, 'dx-collapse-transition')</span>
<span class="cstat-no" title="statement not covered" >    el.style.height = ''</span>
<span class="cstat-no" title="statement not covered" >    el.style.overflow = el.dataset.oldOverflow</span>
<span class="cstat-no" title="statement not covered" >    el.style.paddingTop = el.dataset.oldPaddingTop</span>
<span class="cstat-no" title="statement not covered" >    el.style.paddingBottom = el.dataset.oldPaddingBottom</span>
  }
}
&nbsp;
export default {
  name: 'DxCollapseTransition',
  functional: true,
  render(h, { children }) {
    const data = <span class="cstat-no" title="statement not covered" >{</span>
      on: Transition
    }
<span class="cstat-no" title="statement not covered" >    return h('transition', data, children)</span>
  }
}
&nbsp;</pre></td></tr>
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